X-0.6X+5=7.8
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X-0.6X+5=7.8
X-0.6X+5=7.8
X-0.6X+5=7.8
0.4x+5=7.8
0.4x=2.8
x=7
X=7
0.4X=7.8-5
0.4X=2.8
X=7
x-0.6x二2.8
X-0.6X+5=7.8
X-0.6X+5=7.8
X-0.6X+5=7.8
0.4x+5=7.8
0.4x=2.8
x=7
X=7
0.4X=7.8-5
0.4X=2.8
X=7
x-0.6x二2.8